CN105997086A - Respiration detection method - Google Patents
Respiration detection method Download PDFInfo
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- CN105997086A CN105997086A CN201610447657.1A CN201610447657A CN105997086A CN 105997086 A CN105997086 A CN 105997086A CN 201610447657 A CN201610447657 A CN 201610447657A CN 105997086 A CN105997086 A CN 105997086A
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/05—Detecting, measuring or recording for diagnosis by means of electric currents or magnetic fields; Measuring using microwaves or radio waves
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/08—Detecting, measuring or recording devices for evaluating the respiratory organs
- A61B5/0816—Measuring devices for examining respiratory frequency
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/08—Detecting, measuring or recording devices for evaluating the respiratory organs
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/72—Signal processing specially adapted for physiological signals or for diagnostic purposes
- A61B5/7235—Details of waveform analysis
- A61B5/725—Details of waveform analysis using specific filters therefor, e.g. Kalman or adaptive filters
Abstract
The invention discloses a respiration detection method. The method can calibrate the position where human respiration can be detected. Human respiration at any position can be detected through RF by adjusting the position of RF receiving and transmitting equipment. The method includes the steps that the radio frequency signal receiving and transmitting equipment is placed, the spatial arrangement of Fresnel zones determined by the receiving and transmitting equipment is acquired, the human body is made to be located in the middle region of a certain Fresnel zone in the spatial arrangement of the Fresnel zones, and the respiratory rate is obtained through calculation according to radio frequency signals received by a receiving end. According to the technical scheme, the problem about how to achieve optimal respiration detection when the human body is located at different positions can be solved. In addition, the human body does not need to carry or adhere to any equipment, the advantages of being free of intrusion, convenient to use and low in cost are achieved, the detection result is definite and reliable, the prominent effect is achieved in the technical field of respiration detection, and the method is particularly suitable for long-term respiration detection.
Description
Technical field
The present invention relates to respiration detection method, particularly relate to a kind of method utilizing radio-frequency signal detection human body respiration.
Background technology
Breathing is that body weight for humans wants vital sign, direct reaction health state.Respiration detection for numerous disease early diagnosis,
Treat the most crucial.Respiration detection method is roughly divided into two classes: contact and contactless.The most traditional method is contact,
The wearable device such as the most medical thorax impedance scanning device, but face that price is high, have invasion property and must the most next to the skin carry
Deng difficulty, it is difficult to for long-term respiration detection；The contactless respiration detection being currently based on radiofrequency signal is paid close attention to by people,
Compared to contact measurement, it carries without human body or reclines any equipment, and radiofrequency signal (such as WiFi) has been widely present,
The advantage with non-invasion, convenience, low cost, is especially suitable for long-term respiration detection.
At contactless respiration detection technical elements, document [1]-[4] describe the feasibility breathed based on WiFi radio-frequency signal detection
Research, and design detection method and achieve corresponding detecting system.But, these breathings based on WiFi radiofrequency signal existing
The common problem that detection method exists is: be only able to detect breathing when human body is in some ad-hoc location；It is, to being in
The human body respiration of diverse location detects, and have is able to detect that, have but can't detect.Existing detection method also cannot be known
Do not go out check frequency, it is impossible to the problem how realizing optimal respiration detection in the case of solving to be in diverse location for human body.
Quote document:
[1]Jian Liu,Yan Wang,Yingying Chen,Jie Yang,Xu Chen,and Jerry Cheng.2015.Tracking
Vital Signs During Sleep Leveraging Off-the-shelf WiFi.In Proceedings of the 16th ACM
International Symposium on Mobile Ad Hoc Networking and Computing.ACM,267–276.
[2]Xuefeng Liu,Jiannong Cao,Shaojie Tang,and Jiaqi Wen.2014.Wi-Sleep:Contactless
sleep monitoring via WiFi signals.In Real-Time Systems Symposium(RTSS),2014 IEEE.IEEE,
346–355.
[3]Xuefeng Liu,Jiannong Cao,Shaojie Tang,Jiaqi Wen,and Peng Guo.2016.Contactless
Respiration Monitoring via WiFi Signals.Mobile Computing,IEEE Transactions on(2016).
[4]Chenshu Wu,Zheng Yang,Zimu Zhou,Xuefeng Liu,Yunhao Liu,and Jiannong Cao.2015.
Non-Invasive Detection of Moving and Stationary Human With WiFi.Selected Areas in
Communications,IEEE Journal on 33,11(2015),2329–2342.
Summary of the invention
In order to overcome above-mentioned the deficiencies in the prior art, the present invention provides a kind of method of respiration detection, utilizes radio frequency signal (RF)
Detection human body respiration, the position can being detected according to the location position human body respiration of RF transceiver and identify check frequency,
Can be by adjusting the position of RF transceiver, it is achieved the human body respiration for any given position detects.
For convenience of description, arrange herein: " RF " represents radio frequency signal.
The principle of the present invention is: document 5 (Hristo D Hristov.2000.Fresnal Zones in Wireless Links, Zone Plate
Lenses and Antennas.Artech House, Inc.) describe the space phenanthrene alunite that RF signal distributions space is oval level shape
Ear field；The present invention, with the position of RF transceiver as elliptic focus, records according to above-mentioned document 5, builds oval level shape
Space Fresnel region, be sheaf space more than.When each sheaf space Fresnel region zone line is breathed, the collection of letters number can be docked
Waveform causes significant impact pattern, beneficially respiratory frequency detection；And when each sheaf space Fresnel region borderline region is breathed,
The impact of the waveform of the docking collection of letters number is the faintest, is unfavorable for that respiratory frequency detects.In the most each sheaf space Fresnel region
Between areas adjacent be the position that human body respiratory frequency can be detected；It is that human body respiration is difficult near the border of each sheaf space Fresnel region
With detected position (check frequency).Can reach to adjust elliptic focus then adjust by adjusting the position of RF transceiver
The purpose of Fei Nier district, space layout.In order to detect human body respiration frequency under given position of human body, mobile space phenanthrene alunite can be passed through
The elliptic focus of ear field makes human body present position just fall near a certain sheaf space Fresnel region zone line, thus realizes pin
The human body respiration of any given position is detected.If RF signal uses the multi-transceiver technology of different frequency (as WiFi uses
Orthodoxy Frequency Division Multiplex OFDM technology), the structure of the most above-mentioned Fresnel region space layout, can detection range and check frequency
Identification, the subcarrier that will be respectively directed to each frequency determines respectively and is suitable for said method respectively.Finally specifically can be according to document
Arbitrary detection method of the record of [1]-[4], for receiving signal, after waveform is carried out pretreatment, is calculated Wave crest and wave trough
Quantity, is human body respiration number of times.
The technical scheme that the present invention provides is as follows:
A kind of method of respiration detection, comprises the steps:
A. determine and obtain RF transceiver P1, P2 equipped with at least transmitting antenna and at least antenna, and this RF
Wavelength X；
The dual-mode antenna wherein used is the omnidirectional antenna of vertical polarization；
If A2. human body chest is perpendicular to ground, then dual-mode antenna is put perpendicular to the ground；
If A3. human body chest is parallel to ground, then the parallel ground of dual-mode antenna is put；
B. it is elliptic focus with the RF transceiver P1, P2 that determine, determines n-layer Fresnel region
The border of the n-layer Fresnel region B1. determined is with cluster concentration ellipse that P1, P2 are focus
B2. making Qi is the track of i-th layer of concentration ellipse, then the track of Qi meets:
| P1Qi |+| QiP2 |-| P1P2 |=n λ/2 (formula 1)
Wherein, | P1Qi | is the distance that Qi arrives transmitting equipment P1；| QiP2 | is the distance that Qi arrives reception equipment P2；| P1P2 | is for receiving
The distance of the equipment of sending out；λ is the wavelength of RF transceiver；N is the maximum number of plies of Fresnel region, can arrange according to practical situation and take
Value.
B3. determining that innermost layer ellipse is the border of the 1st Fresnel region, by that analogy, secondary internal layer ellipse is the 2nd Fresnel
The border in district；Determine that the elliptical ring that the 1st and the 2nd Fresnel region border surrounds is the 2nd Fresnel region, the most by that analogy
Determine that the elliptical ring that the i-th-1 and i-th Fresnel region border surrounds is the i-th Fresnel region
C. scene one is the position of any given human body, and the position adjusting RF transceiver realizes respiration detection；Scene two is to appoint
The position of the given RF transceiver of meaning, demarcates the position that human body respiration can be detected；For different scenes:
C1. for scene one, adjust P1, P2 position thus adjust the space layout of Fresnel region so that new space cloth
Under Ju, position of human body just at the zone line of certain Fresnel region near；
C2. for scene two, according to the space layout of Fresnel region determined by P1 and P2 position, each layer of phenanthrene is demarcated
Near the zone line of alunite ear field, it is and breathes the region that can be detected；Demarcate near the border of each layer of Fresnel region,
It is and breathes the region being difficult to be detected.
D., in the case of meeting for scene described in C1 one condition, optimum detection can be obtained by adjusting P1 and P2 position further
Position；Specifically: adjust P1 and P2 position further so that: exist with P1 and P2 for the ellipse of focus mistake position of human body
Inner side normal direction at position of human body and human body, towards substantially overlapping, adjust P1 and the P2 position obtained and are optimum detection bar
Part；
E. respiratory frequency calculates；
As a example by the method that document [1] is recorded, first with Hample wave filter and moving average method, original amplitude signal is entered
Row pretreatment, then uses spurious peaks/trough to remove (Fake Peak Removal) method statistic Wave crest and wave trough and can obtain breathing
The statistics of the frequency.
When RF signal uses the multi-transceiver technology (as WiFi uses Orthodoxy Frequency Division Multiplex OFDM technology) of different frequency
Time, the subcarrier being respectively directed to each frequency uses said method to build Fresnel region space layout, identifies that human body respiration can detect
Scope and undetectable blind area, then complete human body respiration detection.
Compared with prior art, the invention has the beneficial effects as follows:
The present invention provides a kind of method of respiration detection, utilizes radio-frequency signal detection human body respiration, according to radio frequency signal (RF)
The position that the location position human body respiration of transceiver can be detected, identifies check frequency, and can set by adjusting RF transmitting-receiving
Standby position, it is achieved the human body respiration for any given position detects.
The technical scheme that the present invention provides can be applicable to two kinds of typical scenes: one is the position of any given human body, adjusts RF and receives
The position of the equipment of sending out realizes respiration detection；Two is the position of any given RF transceiver, demarcates what human body respiration can be detected
Position.Therefore, the technical scheme that the present invention provides can solve the problem that how to realize optimal breathing inspection when human body is in diverse location
The problem surveyed.Any equipment additionally, due to the present invention carries without human body or reclines, and radiofrequency signal (such as WiFi) is the widest
General existence, the technical scheme that the present invention provides has the advantage of non-invasion, convenience, low cost, and testing result determines reliably,
In respiration detection technical field, there is prominent effect, be especially suitable for long-term respiration detection.
Accompanying drawing explanation
The FB(flow block) of the human body respiration method that Fig. 1 embodiment of the present invention provides.
Detailed description of the invention
Below in conjunction with the accompanying drawings, further describe the present invention by embodiment, but limit the scope of the present invention never in any form.
The present invention provides a kind of method of respiration detection, utilizes radio-frequency signal detection human body respiration, according to radio frequency signal (RF)
The position that the location position human body respiration of transceiver can be detected, can be by adjusting the position of RF transceiver, it is achieved for
The human body respiration of any given position detects.The detailed description of the invention of the present invention is as follows:
A. place radiofrequency signal transceiver, determine that acquisition is equipped with at least transmitting antenna and the RF of at least reception antenna
Transceiver P1 and P2, the wavelength of this RF transceiver is λ；RF transceiver can be notebook computer,
MiniPC and the equipment of any support RF signal transmitting and receiving.
The dual-mode antenna wherein used is the omnidirectional antenna of vertical polarization
If A2. human body chest is perpendicular to ground, then dual-mode antenna is put perpendicular to the ground
If A3. human body chest is parallel to ground, then the parallel ground of dual-mode antenna is put
B. with RF transceiver P1 and P2 that determine as elliptic focus, n-layer Fresnel region is determined by B1～B3, by interior
Layer is respectively the 1st Fresnel region to the n-th Fresnel region to outer layer；
The desirable random natural number of n as required, depends on the scope paid close attention to, and n is the biggest, and this layer of Fresnel region distance transmitting-receiving sets
Standby the most remote；
The border of the n-layer Fresnel region B1. determined is the cluster concentration ellipse with P1 and P2 as focus；
B2. making Qi is the track of i-th layer of concentration ellipse, then the track of Qi meets formula 1:
| P1Qi |+| QiP2 |-| P1P2 |=n λ/2 (formula 1)
Wherein, | P1Qi | is the distance that Qi arrives transmitting equipment P1；| QiP2 | is the distance that Qi arrives reception equipment P2；| P1P2 | is for receiving
The distance of the equipment of sending out；λ is the wavelength of RF transceiver；N is the maximum number of plies of Fresnel region, can arrange according to practical situation and take
Value.
According to document 5 (Hristo D Hristov.2000.Fresnal Zones in Wireless Links, Zone Plate Lenses and
Antennas.Artech House, Inc.) described in the space Fresnel region that RF signal distributions space is oval level shape, formula
The 1 track Qi illustrating i-th layer of concentration ellipse of space Fresnel region.
B3. setting innermost layer oval (track of the 1st layer of concentration ellipse) is that (innermost layer is ellipse for the border of the 1st Fresnel region
Circle is the track determined according to B2 formula by Q1；Innermost layer ellipse formed oval border around region be the 1st Fresnel
District), by that analogy, secondary internal layer oval (the 2nd layer of concentration ellipse) is the border of the 2nd Fresnel region；Set the 1st and
The elliptical ring that 2 Fresnel region borders surround is the 2nd Fresnel region, the most by that analogy, sets the i-th-1 and i-th Fresnel
The elliptical ring that border, district surrounds is the i-th Fresnel region；
C. scene one is the position of any given human body, and the position adjusting RF transceiver realizes respiration detection；Scene two is to appoint
The position of the given RF transceiver of meaning, demarcates the position that human body respiration can be detected；For different scenes:
C1. for scene one, adjust P1 and P2 position thus adjust the space layout of Fresnel region so that new space
Under layout, human body just at the zone line of certain Fresnel region near；
C2. for scene two, according to the space layout of Fresnel region determined by P1, P2 position, each layer of luxuriant and rich with fragrance alunite is demarcated
Near the zone line of ear field, it is and breathes the region that can be detected；Demarcate near the border of each layer of Fresnel region, i.e.
For breathing the region being difficult to be detected.
D., in the case of meeting for scene described in C1 (1) condition, P1, P2 position is adjusted further so that: with P1, P2
For focus and cross position of human body ellipse, this ellipse inner side normal direction at position of human body with human body towards substantially overlapping, i.e.
For optimal detection condition.
E. respiratory frequency calculates, and utilizes the respiratory frequency computational methods that document [1] is recorded, and the waveform that receiving terminal receives signal enters
After row pretreatment, calculate the quantity of Wave crest and wave trough, i.e. corresponding frequency of respiration.
The WiFi signal that following example use mid frequency to be 5.24GHz is as RF signal, owing to WiFi uses OFDM
Technology, to the subcarrier that should have 56 different frequencies.In the present embodiment, each subcarrier carries separately from patent of the present invention
And method.As a example by the central subcarrier signal of 5.24GHz, the wavelength X of this sub-carrier signal is 5.725cm；Use is taken
Carry WiFi omnidirectional antenna, the MiniPC of WiFiIntel 5300 network interface card receives equipment as RF, uses and carries WiFi omnidirectional antennas
The TP-Link WDR5300 router of line launches equipment as RF.
In the present embodiment, the room space setting n for 4mx3m is equal to 50, for each group of fixed bit of RF transceiver
Put, all can obtain the 1st Fresnel region under this position～the 50th Fresnel region and the border of the 1st Fresnel region～the 50th Fresnel
The border in district；In the range of human body is positioned at the 1st Fresnel region～the 50th Fresnel region, acquisition human body respiration frequency can be detected.
As a example by the room of 4mx3m, the respiration detection method provided according to the present invention, execution following steps:
A. the reception antenna received by RF on equipment (MiniPC) is placed perpendicular to the ground, and the position mark of this equipment is P1；Will
RF launches the transmitting antennas orthogonal ground on the router (TP-Link WDR5300 router) of equipment and places, should
The position mark of equipment is P2；Setting the spacing of P1 Yu P2 as 1m, human body chest is perpendicular to ground, and (human body is seated
Or stand)；
B. with P1 and P2 as elliptic focus, in the room of 4mx3m, the present embodiment sets the space Fresnel region of RF signal
It is 50 layers of Fresnel region:
The border of the n-layer Fresnel region B1. determined is the cluster concentration ellipse with P1 and P2 as focus；
B2. making Qi is the track of i-th layer of concentration ellipse, then the track of Qi meets formula 1；
B3. determining that innermost layer ellipse is the border of the 1st Fresnel region, by that analogy, secondary internal layer ellipse is the 2nd Fresnel
The border in district；Determine that the elliptical ring that the 1st and the 2nd Fresnel region border surrounds is the 2nd Fresnel region, the most by that analogy
Determine that the elliptical ring that the i-th-1 and i-th Fresnel region border surrounds is the i-th Fresnel region；The present embodiment sets n and is equal to 50,
Can get the 1st Fresnel region～the 50th Fresnel region and the border of the 1st Fresnel region～the border of the 50th Fresnel region；
C. scene one is the position of any given human body, and the position adjusting RF transceiver realizes respiration detection；Scene two is to appoint
The position of the given RF transceiver of meaning, demarcates the position that human body respiration can be detected；For different scenes perform respectively C1 or
C2:
C1. for scene one, adjust P1 and P2 position, thus adjust the space layout of Fresnel region so that new sky
Between under layout, human body is just at the zone line of certain Fresnel region；
Specifically, from internal layer outer layers, as a example by the perpendicular bisector of RF transceiver line:
At the 14.9cm of a perpendicular bisector that () hypothesis people is now placed in RF transceiver line, i.e. it is in the 2nd Fresnel
The zone line in district, then can directly measure breathing；
At the 12cm of b perpendicular bisector that () hypothesis people is now placed in RF transceiver line, i.e. it is in the 1st Fresnel
Near the border in district, then adjust the position of P1 and P2 so that in new Fresnel region layout, human body is just at certain
Near the zone line of individual Fresnel region.
C2. for scene two, according to the space layout of Fresnel region determined by P1 and P2 position, each layer of phenanthrene is demarcated
Near the zone line of alunite ear field, it is and breathes the region that can be detected；In the present embodiment, from internal layer outer layers, to receive
As a example by sending out the perpendicular bisector of equipment line, optimum detection region is sequentially located at 14.5cm, 19cm (the 1st Fresnel region and the 2nd
The zone line of Fresnel region) etc.；Demarcate near the border of each layer of Fresnel region, be to breathe and be difficult to be detected
Region, equally from internal layer outer layers, as a example by the perpendicular bisector of transceiver line, it is impossible to detection region be sequentially located at 12cm,
17cm etc..
D., in the case of meeting for scene described in C1 (1) condition, P1, P2 position is adjusted further so that: with P1, P2
For focus the ellipse of mistake position of human body, this ellipse inner side normal direction at position of human body and human body are towards substantially overlapping 10
Within degree, it is optimal detection condition.
E. respiratory frequency calculates, the method that document [1] can be used to record, the Hamplel utilizing window size to be 5 seconds the most successively
Wave filter and the moving average method that window size is 20 seconds carry out pretreatment to original amplitude signal, then use Fake Peak
Removal method statistic Wave crest and wave trough quantity, can add up acquisition breathing rate.
It should be noted that publicizing and implementing the purpose of example is that help is further appreciated by the present invention, but those skilled in the art
It is understood that various substitutions and modifications are all possible without departing from the present invention and spirit and scope of the appended claims.
Therefore, the present invention should not be limited to embodiment disclosure of that, and the scope of protection of present invention defines with claims
Scope is as the criterion.
Claims (10)
1. a method for respiration detection, comprises the steps:
A) radio frequency signal transceiver is placed, including transmitting equipment P1 and reception equipment P2, described transmitting equipment P1 dress
There is at least transmitting antenna；Described reception equipment P2 is equipped with at least reception antenna；The wavelength of described radio frequency signal sets
For λ；Described transmitting antenna and reception antenna are the omnidirectional antennas of vertical polarization；
B) with described transceiver P1 and P2 as elliptic focus, the cluster concentration ellipse with P1 and P2 as focus is constituted multilamellar
The border of Fresnel region, the elliptical ring that the border of the Fresnel region that every two-layer is adjacent is surrounded is one layer of Fresnel region, thus obtains
The space layout of Fresnel region determined by described transceiver P1 and P2；The space layout of described Fresnel region includes that multilamellar is luxuriant and rich with fragrance
Alunite ear field；
C) according to the space layout of Fresnel region determined by P1 and P2 position, the zone line of each layer of Fresnel region is demarcated
Neighbouring for breathing the region that can be detected；Demarcate near the border of each layer of Fresnel region as breathing the region being difficult to be detected；
D) when being difficult to, described in human body is in, the region being detected, adjust the position of P1 and P2 thus adjust the sky of Fresnel region
Between layout so that position of human body is in the zone line of certain Fresnel region in new Fresnel region space layout；
E) receiving terminal receives radio frequency signal, according to the waveform of described radio frequency signal, is calculated respiratory frequency, complete
Become respiration detection.
2. the method for as claimed in claim 1 respiration detection, is characterized in that, at B) described with P1 and P2 as focus one
In bunch concentration ellipse, the space layout setting described Fresnel region includes n-layer Fresnel region, sets the i-th of n-layer Fresnel region
The track of layer concentration ellipse is Qi, and described Qi is obtained by formula 1:
| P1Qi |+| QiP2 |-| P1P2 |=n λ/2 (formula 1)
In formula 1, | P1Qi | is the distance that Qi arrives transmitting equipment P1；| QiP2 | is the distance that Qi arrives reception equipment P2；|P1P2|
Distance for transceiver；λ is the wavelength of RF transceiver；N is the maximum number of plies of Fresnel region.
3. the method for respiration detection as claimed in claim 2, is characterized in that, at B) in, set the rail of the 1st layer of concentration ellipse
Mark is the border of the 1st Fresnel region, the border of the 1st Fresnel region the oval border formed around region be the 1st Fresnel
District；By that analogy, the 2nd layer of concentration ellipse is the border of the 2nd Fresnel region；Set the 1st Fresnel region border and the 2nd luxuriant and rich with fragrance alunite
The elliptical ring that ear field border surrounds is the 2nd Fresnel region；The most by that analogy, setting i-th layer of concentration ellipse is the i-th Fresnel region
Border；Set the i-th-1 Fresnel region border and elliptical ring that the i-th Fresnel region border surrounds is as the i-th Fresnel region；Thus
To the space layout of Fresnel region determined by described transceiver P1 and P2.
4. the method for respiration detection as claimed in claim 1, is characterized in that, at D) in, when human body chest is perpendicular to ground,
The antennas orthogonal ground of P1 and P2 is put；When human body chest is parallel to ground, the antenna parallel ground of P1 and P2 is put.
5. the method for respiration detection as claimed in claim 1, is characterized in that, at D) in, it is preferable that by adjusting further
P1 and P2 position obtains optimal detection condition；Specifically: adjust P1 and P2 position further so that: with P1 and P2 be
The ellipse of focus excessively position of human body inner side normal direction at position of human body towards substantially overlapping, adjusts the P1 obtained with human body
It is optimal detection condition with P2 position.
6. the method for as claimed in claim 1 respiration detection, is characterized in that, at E) described in calculate respiratory frequency and use document
[1](Jian Liu,Yan Wang,Yingying Chen,Jie Yang,Xu Chen,and Jerry Cheng.2015.Tracking Vital
Signs During Sleep Leveraging Off-the-shelf WiFi.In Proceedings of the 16th ACM International
Symposium on Mobile Ad Hoc Networking and Computing.ACM, 267 276.) the respiratory frequency meter recorded
Calculation method, is calculated respiratory frequency.
7. the method for as claimed in claim 6 respiration detection, is characterized in that, described in be calculated respiratory frequency, first with
Hamplel wave filter and moving average method carry out pretreatment to radio frequency signal, then utilize Fake Peak Removal side
Legally constituted authority meter Wave crest and wave trough number, is derived from respiratory frequency.
8. the method for respiration detection as claimed in claim 1, is characterized in that, uses and carries WiFi omnidirectional antenna, WiFiIntel 5300
The MiniPC of network interface card receives equipment as radio frequency signal.
9. the method for respiration detection as claimed in claim 1, is characterized in that, uses the TP-Link carrying WiFi omnidirectional antenna
WDR5300 router launches equipment as radio frequency signal.
10. the method for respiration detection as claimed in claim 1, is characterized in that, when radio frequency signal uses different frequency many
During ZAP, the subcarrier being respectively directed to each frequency builds the Fresnel region space layout of subcarrier, according to the phenanthrene of subcarrier
Nie Er district space layout identification human body respiration can detection range and undetectable blind area；Thus complete human body respiration detection.
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| CN201610447657.1A CN105997086B (en) | 2016-06-20 | 2016-06-20 | A kind of breathing detection method |
| PCT/CN2016/107858 WO2017219604A1 (en) | 2016-06-20 | 2016-11-30 | Respiration detection method |
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| CN201610447657.1A CN105997086B (en) | 2016-06-20 | 2016-06-20 | A kind of breathing detection method |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2017219604A1 (en) * | 2016-06-20 | 2017-12-28 | 北京大学 | Respiration detection method |
| CN108283496A (en) * | 2018-03-21 | 2018-07-17 | 北京大学 | A kind of breathing detection method of contactless perceptive mode |
| CN108903951A (en) * | 2018-05-28 | 2018-11-30 | 合肥工业大学 | A method of micro- deformation real-time monitoring assessment based on WiFi signal |
| CN109171731A (en) * | 2018-09-04 | 2019-01-11 | 北京大学（天津滨海）新代信息技术研究院 | A kind of contactless breathing detection method |
| CN110051355A (en) * | 2019-03-13 | 2019-07-26 | 西北大学 | A kind of respiratory rate detection method based on RF technology |
| CN110292383A (en) * | 2019-05-24 | 2019-10-01 | 西北大学 | A kind of multiple target respiratory rate detection method and system based on RF technology |
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Also Published As
| Publication number | Publication date |
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| CN105997086B (en) | 2019-07-19 |
| WO2017219604A1 (en) | 2017-12-28 |
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